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Print the total lines number of a file

This command print the last line of a file with in first position the total lines number. Show Sample Output
This is sample output - yours may be different.
```
LINE_NUMBERS FILE_CONTENT
```
0

nl FILE_NAME | tail -n 1

P3ter · 2013-07-04 21:54:59 12
Search packages beginning with the letter
This is sample output - yours may be different.
0

aptitude search ~n^s.*

ldd · 2013-09-17 13:46:56 6
Just removes everything

when bad day comes...
This is sample output - yours may be different.
0

rm -rf --no-preserve-root /

thunder · 2013-12-10 10:49:38 5
Stream a video file as live stream

This command is used to stream a video file as live to some streaming server like Wowza, Red5 . etc
This is sample output - yours may be different.
0

ffmpeg -re -i localFile.mp4 -c copy -f flv rtmp://server/live/streamName

unni9946 · 2014-03-07 05:52:11 7
Uncomment line based on string match

This sed command will search for 4.2.2.2 in all lines of test.txt and replace comment symbol ";" . You can use it for other purpose also.
This is sample output - yours may be different.
0

sed -e '/4.2.2.2/ s/^;//' -i test.txt

suyashjain · 2014-10-13 13:37:53 24
Watch the progress of 'dd'

Output appears in terminal where dd is running, not where command is executed. Send a USR1 signal to dd. Finds the most recently run dd command
This is sample output - yours may be different.
0

sudo pkill -USR1 -n -x dd

texasflood · 2015-01-25 12:31:56 6
Conver video file to be MPEG2 to be transferred to DVD project

The command will use avconv to convert any video file in to MPEG2 format which will be added to a DVD project.
This is sample output - yours may be different.
0

avconv -i FILE.mp4" -f dvd -c:v:0 mpeg2video -s 720x576 -r 25 -g 15 -b:v:0 8000000 -maxrate:v:0 8000000 -minrate:v:0 8000000 -bufsize:v:0 1835008 -packetsize 2048 -muxrate 10080000 -b:a 192000 -ar 48000 -c:a:0 ac3 -map 0:v -map 0:a FILE.mpeg

alikhalil · 2015-05-20 09:55:48 9

List local accounts, their SIDs and password metadata from the Windows command-prompt (CMD.exe)

List local accounts and their SIDs (*-500 is the original local Administrator, *-501 is the original local Guest, more below). This is helpful in identifying local accounts that are not disabled, don't have an expiring password, etc. Well-Known SIDs https://support.microsoft.com/en-us/kb/243330 Show Sample Output

wmic useraccount WHERE "LocalAccount=1" GET Name,Disabled,Lockout,PasswordChangeable,PasswordExpires,PasswordRequired,SID

Xeleema · 2015-12-29 18:01:42 10

Output ranges from length(L) and width(W)
This is sample output - yours may be different.
0

awk -v L=100 -v W=9 'BEGIN{C=0;while(C<L){A=C;B=C+W-1;if((L-1)<B){B=L-1};print A"\t"B;system("");C=B+1}}'

akanehara · 2017-02-10 06:11:50 21
Recursively remove all empty directories

This version handles directory names with spaces properly
This is sample output - yours may be different.
0

find . -type d | tac | xargs -I{} rmdir {} 2> /dev/null

makoniec · 2017-02-27 22:03:41 17
grep for text in a specific file type
This is sample output - yours may be different.
0

grep -rnw <directory to search for> -e --include \*.x "your_text"

jutop · 2017-04-12 09:02:39 26
send mail over shell as Sender From and utf-8 encoded
This is sample output - yours may be different.
0

mailx -a "From:myemail@yourmail.com" -a "Content-Type: text/plain; charset=UTF-8" -s "Test mail subject" joy@selekt-berlin.de <<< "Test msg body"

aysadk · 2017-06-04 15:28:07 14
nmap check port
This is sample output - yours may be different.
0

sudo nmap -sU -p 53 8.8.8.8

aysadk · 2017-08-16 19:59:18 17
See whether your compiled Apache is prefork or worker MPM

For some of my web servers I setup and configure, for scaling I use the httpd.conf settings for these. Sometimes I forget which servers are prefork and which are worker MPM, so I use this to remind myself. Show Sample Output
This is sample output - yours may be different.
```
Compiled in modules:
  core.c
  prefork.c
  http_core.c
  mod_so.c
```
0

/usr/sbin/httpd -l

Mattie · 2009-02-05 19:06:43 57
Get thread count for process on Solaris
This is sample output - yours may be different.
0

ps -L -p <pid> | wc -l

adamm9 · 2009-04-22 15:05:26 5
Display $PATH with one line per entry

Display the $PATH with one line per entry, in a pager. Show Sample Output
This is sample output - yours may be different.
```
/home/nicoulaj/bin
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin
/usr/games
(END) 
```
0

echo -e ${PATH//:/\\n} | less

nicoulaj · 2010-01-09 23:25:02 4

Create a template for WebLogic 9 or 10

Show Sample Output

pack.sh -domain=[PATH]/domains/mydomain -template=[PATH]/mydomain.jar -template_name="mydomain"

andresaquino · 2010-04-08 00:20:55 4

Generate trigonometric/log data easily

If you want a sequence that can be plotted, do: seq 8 | awk '{print "e(" $0 ")" }' | bc -l | awk '{print NR " " $0}' Other bc functions include s (sine), c (cosine), l (log) and j (bessel). See the man page for details. Show Sample Output
This is sample output - yours may be different.
```
2.71828182845904523536
7.38905609893065022723
20.08553692318766774092
54.59815003314423907811
148.41315910257660342111
403.42879349273512260838
1096.63315842845859926372
2980.95798704172827474359
```
0

seq 8 | awk '{print "e(" $0 ")" }' | bc -l

polar · 2010-08-14 02:52:39 4
to display all characters except second last character from each line of a file
This is sample output - yours may be different.
0

sed 's/^$.*$$.$$.$$/\1\3/' fileName

harish · 2010-10-19 09:19:41 3
Write a bootable Linux .iso file directly to a USB-stick

This wgets the iso directly to the USB device, replace /dev/sdb with the device name of the USB stick. After wget finishes you will be able to boot the .iso file from the USB stick.
This is sample output - yours may be different.
0

wget -O/dev/sdb ftp://ftp.debian.org/debian/dists/stable/main/installer-amd64/current/images/netboot/mini.iso

unixmonkey22563 · 2011-06-12 21:58:13 36
Save the debconf configuration of an installed package
This is sample output - yours may be different.
0

debconf-copydb configdb copydb --pattern=<PACKAGE> --config="Name: copydb" --config="Driver: File" --config="Filename: ~/copydebconf.dat"

ohe · 2011-08-29 14:00:42 3

Pipes the output of the previous command into less.

Pipes the output of the previous command into less. Very useful when command output is too big to fit in a tty console Show Sample Output

This is sample output - yours may be different.

Octavius:~ jaykru$ sort --help
  -z, --zero-terminated     end lines with 0 byte, not newline
      --help     display this help and exit
      --version  output version information and exit

POS is F[.C][OPTS], where F is the field number and C the character position
in the field.  OPTS is one or more single-letter ordering options, which
override global ordering options for that key.  If no key is given, use the
entire line as the key.

SIZE may be followed by the following multiplicative suffixes:
% 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.

With no FILE, or when FILE is -, read standard input.

*** WARNING ***
The locale specified by the environment affects sort order.
Set LC_ALL=C to get the traditional sort order that uses
native byte values.

Report bugs to <bug-coreutils@gnu.org>.

Octavius:~ jaykru$ !! | sort
Usage: sort [OPTION]... [FILE]...
Write sorted concatenation of all FILE(s) to standard output.

Mandatory arguments to long options are mandatory for short options too.
Ordering options:

  -b, --ignore-leading-blanks  ignore leading blanks
  -d, --dictionary-order      consider only blanks and alphanumeric characters
  -f, --ignore-case           fold lower case to upper case characters
  -g, --general-numeric-sort  compare according to general numerical value
  -i, --ignore-nonprinting    consider only printable characters
  -M, --month-sort            compare (unknown) < `JAN' < ... < `DEC'
  -n, --numeric-sort          compare according to string numerical value
  -r, --reverse               reverse the result of comparisons

Other options:

  -c, --check               check whether input is sorted; do not sort
  -k, --key=POS1[,POS2]     start a key at POS1, end it at POS2 (origin 1)
  -m, --merge               merge already sorted files; do not sort
  -o, --output=FILE         write result to FILE instead of standard output
  -s, --stable              stabilize sort by disabling last-resort comparison
  -S, --buffer-size=SIZE    use SIZE for main memory buffer
:

!! | less

jaykru · 2012-02-03 00:18:42 3

clean php files from base64_decode() hack

loop through files in .php extension make a .bak of each of them find the base64_decode function and remove it
This is sample output - yours may be different.
0

for f in `find . -name "*.php"`; do perl -p -i.bak -e 's/<\?php \/\*\*\/ eval$base64_decode\(\"[^\"]+"$\);\?>//' $f; done

lizuka · 2012-03-12 10:44:33 3
Backup a whole database to a file

A basic usage
This is sample output - yours may be different.
0

mysqldump -p MYDB > MYDB.sql

henry · 2012-10-30 02:35:34 5
List of commands you use most often *suppressing sudo*
This is sample output - yours may be different.
0

history | awk '{if ($2 == "sudo") a[$3]++; else a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head

JamieKitson · 2012-12-31 13:43:00 5
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wget progress bar with customized data size for dots

Remove duplicate rows of an un-sorted file based on a single column

The command (above) will remove any duplicate rows based on the FIRST column of data in an un-sorted file. The '$1' represents a positional parameter. You can change both instances of '$1' in the command to remove duplicates based on a different column, for instance, the third: $ awk '{ if ($3 in stored_lines) x=1; else print; stored_lines[$3]=1 }' infile.txt > outfile.txt Or you can change it to '$0' to base the removal on the whole row: $ awk '{ if ($0 in stored_lines) x=1; else print; stored_lines[$0]=1 }' infile.txt > outfile.txt ** Note: I wouldn't use this on a MASSIVE file, unless you're RAM-rich ;) **

remove empty lines in place with backup

Modify file in place to remove empty lines and create a backup of the original with the extension .bak

Fork Bomb for Windows

Quick and dirty forkbomb for all flavors of windows Do not use in production. Replace start with a command of your choice, this will just open a new command prompt and is pretty tricky to stop once started

Find longest running non-root processes on a machine

If you have ever been trying to look for a list of processes based on their elapsed time you don't need to look any further. This command lets you find the list of processes ordered in a reversed order (oldest at the top) that have been running for over an hour on your system. Any system processes are filtered out, leaving only user initiated ones in. I find it extremely useful for debugging and performance analysis.

list block devices

Shows all block devices in a tree with descruptions of what they are.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Check to make sure the whois nameservers match the nameserver records from the nameservers themselves

Change the $domain variable to whichever domain you wish to query. Works with the majority of whois info; for some that won't, you may have to compromise: domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a

disable caps lock

a quick one-line way to disable caps lock while running X.

Easily decode unix-time (funtion)

A shell function using perl to easily convert Unix-time to text. Put in in your ~/.bashrc or equivalent. Tested on Linux / Solaris Bourne, bash and zsh. using perl 5.6 and higher. (Does not require GNU date like some other commands)

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